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A Commitment to Care for the Communities we Serve

Since 1929, Christie Clinic has been providing the people of east central Illinois with the highest quality health care. As one of Illinois’ largest physician-owned, multi-specialty medical practices our approach to meeting your health care needs is simple…our physicians and staff are known for a truly personal touch. This care transfers to Christie Clinic’s Transformations program led by Dr. Nathan Walker, a Christie Clinic internal medicine physician. Health coaches support Dr. Walker and meet with participants on a weekly basis to review their progress and discuss any challenges they may have.

Our Staff

Nathan Walker, M.D., Transformations Medical Director

As a doctor, I see firsthand the impact that obesity has on many aspects of a person’s life and health. That is the reason that Christie Clinic’s Transformations was conceived: to see the powerful and positive effects of weight loss in transforming lives.  Transformations is both a professional and a personal mission for me because of the life-altering change that weight loss can bring to life.

Hobbies:  I love outdoor activities and am an avid runner. It was my great pleasure to serve as Medical Director for the Christie Clinic Illinois Marathon for three years.  My wife and I enjoy the school and sport activities of our six lively children who keep our lives very busy.

aoberheimAmber Oberheim, Certified Nurse Practitioner

My relationship with my patients is very special. I take the time to listen to their needs and work with them to develop a plan of care. Remaining approachable and down-to-earth has helped me really get to know the people who trust me with their healthcare needs. I learned very early in my career that if I treat my patients like I would my own family members, then I am doing it right. I also choose to lead by example. I don’t believe that I can ask my patients to eat right, exercise, and follow a healthy lifestyle if I don’t do those things myself.

Hobbies:  My time away from work is almost always spent with my family. My husband, Chris, and I have 4 beautiful daughters- Hannah, Avery, & twins Addison and Aubree. Our girls keep us very busy with various different activities including travel softball, dance, basketball, soccer, and school activities. In addition to spending time with my family, I enjoy traveling, reading, and attending sporting events.

Transformations Health Coaches

 Our Goal is to help you reach yours! 


About Yourself: Weight loss has been a great part of my adult life. I would lose weight, only to gain it back time and time again.  I finally found the diet that gave me my life back. We are not just another diet, but a new lifestyle change. I have lost over 60 lbs. and have maintained it over eight months.

I have learned so much about living a healthy life that I want to motivate and share this with others so they can achieve their goals as well.

Hobbies:  Spending time with family and friends, golfing, shopping, and taking walks


About Yourself: Transformations changed my life in an extremely positive way.  With the help of my coach and other dieters, I lost 65 pounds and have been able to maintain the loss for nearly six years.   As a coach, I enjoy helping others achieve their goals of losing weight, learning new eating habits, and adjusting to a transformed lifestyle.  I also lead the two support groups, Transformers and the Transformations Lifestyle.  I believe that we’re on a diet our entire lives; Transformations helps us lose weight as well as unhealthy habits, creating a new way of living through a healthier diet.

Hobbies: In my spare time, I enjoy reading and cooking. My partner, Steve, and I enjoy spending time with friends and family, our dogs, and playing card games.


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